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Short-lived fission products from 235U using monoenergetic neutrons

ORAL

Abstract

Fission product yields (FPYs) are among the fundamental fission observables that play crucial roles in basic and applied nuclear physics. Accurate knowledge of the FPYs is necessary for addressing questions relevant to nucleosynthesis in the cosmos, resolving the reactor antineutrino anomaly, decay heat release in nuclear reactors, and national security applications. In this talk, I will discuss an ongoing campaign by the LLNL-LANL-TUNL collaboration to measure the cumulative FPYs from neutron-induced fission of 235,238U and 239Pu at the Triangle Universities Nuclear Laboratory (TUNL). Emphasis will be given on our recent experimental effort utilizing the RApid Belt-driven Irradiated Target Transfer System (RABITTS) to measure short-lived (T1/2 ~ minutes to seconds) fission products extending our previous long-lived (T1/2 > 1 hour) FPY measurements[1]. An overview of the experimental methods with the RABITTS and some preliminary data for the 235U(n,f) reaction at En=4.6 MeV will be presented.

This work was performed under the auspices of the U.S. DOE by LLNL under contract DE-AC52-07NA27344.

[1] M.E. Gooden et al., "Energy Dependence of Fission Product Yields from 235U, 238U, and 239Pu for Incident Neutron Energies Between 0.5 and 14.8 MeV." Nuclear Data Sheets 131, 319 (2016).

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Presenters

  • Anthony Paul Ramirez

    Lawrence Livermore National Laboratory

Authors

  • Anthony Paul Ramirez

    Lawrence Livermore National Laboratory

  • Jack A Silano

    Lawrence Livermore National Laboratory

  • Mark A Stoyer

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Anton P Tonchev

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Matthew E Gooden

    Los Alamos National Laboratory

  • Todd A Bredeweg

    Los Alamos National Laboratory, Los Alamos Natl Lab

  • David Vieira

    Los Alamos National Laboratory

  • Vanessa Linero

    Colorado School of Mines

  • Sean W Finch

    Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308, TUNL and Duke University, Duke University, TUNL/Duke University

  • Werner Tornow

    Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308, TUNL and Duke University, Duke University, TUNL/Duke University

  • Calvin R Howell

    TUNL and Duke University, Duke University

  • FNU Krishichayan

    Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308, TUNL and Duke University, Duke University